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参数资料
| 型号： | REF01AJ/883C |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 10 V, MBCY8 |
| 封装： | MO-002AK, METAL CAN, TO-99, 8 PIN |
| 文件页数： | 6/20页 |
| 文件大小： | 593K |
| 代理商： | REF01AJ/883C |
REF01/REF02/REF03
Rev. J | Page 14 of 20
THEORY OF OPERATION
REF01, REF02, and REF03 are high precision, low drift 10.0 V,
5.0 V, and 2.5 V voltage references available in a variety of
packages. These devices are standard band gap references (see
Figure 33). The band gap cell contains two NPN transistors
(Q18 and Q19) that differ in emitter area by a factor of 2. The
difference in the VBE values of these transistors produces a
proportional-to-absolute temperature current (PTAT) through
R14, and, when combined with the VBE of Q19, produces a band
gap voltage, VBG, that is almost constant over temperature.
With an internal op amp and the feedback network created by
R5 and R6, VO is set precisely at 10.0 V, 5.0 V, or 2.5 V. Precision
laser trimming of various resistors and other proprietary circuit
techniques are used to further enhance the initial accuracy,
temperature curvature, and drift performance of the device.
The PTAT voltage is brought out directly from the band gap,
unbuffered, at the TEMP pin. Since this voltage output has a
stable 1.96 mV/°C temperature coefficient, users can estimate
the temperature change of the device by simply monitoring the
change in voltage at this pin.
R1
R2
R3
R4
VIN
Q23
Q1
Q2
Q7
Q8
Q9
Q3
Q10
D1
D2
Q4
VO
D3
C1
R13
Q12
Q13
R5
I1
R12
Q14 Q15
2×
1×
VBG
R20
TRIM
Q18
TEMP
R27
Q19
Q16
Q17
Q20
R6
R24
R32
R14
3
R42
R41
R11
R17
GND
00
37
5-
03
Figure 33. REF0x Simplified Schematic
INPUT AND OUTPUT CAPACITORS
Figure 34 shows the basic input/output capacitor configuration
for the REF0x series of references.
U1
REF01/
REF02/
REF03
VO
C2
0.1F
C1
0.1F
VIN
VOUT
TEMP TRIM
GND
34
00
37
5-
0
Figure 34. Basic REF0x Capacitor Configuration
While the REF0x series of references are designed to function
stably without any external components, connecting a 0.1 μF
ceramic capacitor to the output is highly recommended to
improve stability and filter out low level voltage noise. An
additional 1 μF to 10 μF electrolytic, tantalum, or ceramic
capacitor can be added in parallel to improve transient perfor-
mance in response to sudden changes in load current; however,
the designer should keep in mind that doing so increases the
turn-on time of the device.
A 1 μF to 10 μF electrolytic, tantalum, or ceramic capacitor
can also be connected to the input to improve transient
response in applications where the supply voltage may fluctuate.
An additional 0.1 μF ceramic capacitor should be connected in
parallel to reduce supply noise.
Both input and output capacitors should be mounted as close to
the device pins as possible.
OUTPUT ADJUSTMENT
The REF0x trim terminal can be used to adjust the output
up or down from the internally trimmed, nominal output
voltage. This feature allows the system designer to trim out
system errors due to changes in line and load conditions,
thermal hysteresis, output offset due to solder reflow, or other
error sources. The basic trim circuit configuration is shown
in Figure 35.
Table 7 also lists the range of output voltages obtainable from
each model in this configuration.
U1
REF01/
REF02/
REF03
VIN
VOUT
TEMP TRIM
GND
VIN
VO
POT
10k
R2
1k
R1
470k
00
37
5-
03
5
Figure 35. Optional Trim Adjustment Circuit
Table 7. Adjustment Range Using Trim Circuit
Model
VOUT, Low Limit
VOUT, High Limit
REF01
9.70 V
10.05 V
REF02
4.95 V
5.02 V
REF03
2.3 V
2.8 V
Adjustment of the output does not significantly affect the
temperature performance of the reference itself, provided the
temperature coefficients of the resistors used are low.
TEMPERATURE MONITORING
In addition to the optional TRIM function, the REF0x series of
references provides the ability to monitor changes in temper-
ature by way of tracking the voltage present at the TEMP pin.
The output voltage of this pin is taken directly from the band
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相关代理商/技术参数 |
参数描述 |
|---|---|
| REF01AP | 制造商:未知厂家 制造商全称:未知厂家 功能描述:IC-+10V PRECISION REF |
| REF01AQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| REF01AU | 制造商:Texas Instruments 功能描述: |
| REF01AZ | 制造商:Maxim Integrated Products 功能描述:8 PINS CDIP PKG - Bulk 制造商:Rochester Electronics LLC 功能描述:+10V PRECISION VOLTAGE RE - Bulk 制造商:Analog Devices 功能描述:SEMICONDUCTOR ((NS)) |
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